AMETEK PI - Model 931 - Single Gas H2S Analyzer
From UV Vis Spectrometers
Measuring hydrogen sulfide (H2S), the 931 is a rugged, single-ultraviolet (UV) component photometric analyzer with a low-maintenance, no-moving-parts design, housed in an explosion-proof package. It can also be configured for primary measurements of sulfur dioxide (SO2), carbonyl sulfide (COS), carbon disulfide (CS2) or ammonia (NH3), and provided with a thermal conductivity detector (TCD) for the measurement of hydrogen (H2).
Product Details
The 931 is a “hot-wet” analyzer with a heated cell oven to avoid condensation. A fully integrated sample system ensures reliable dew point control without running the risk of plugging, contaminating, or flooding the analyzer.
Providing a flexible, configurable solution to a range of complex process control requirements, the 931 is ideal for sulfur recovery and sour gas pipeline applications in the hydrocarbon processing industry.
FIXED OPTICAL CONFIGURATION
Instead of using a filter/chopper wheel to alternate between measure and reference wavelengths, the 931 uses a fixed optical configuration and pulsed UV lamps. This design leads to increased light throughput, reduced noise levels, and reduced maintenance.
UNPARALLELED LINEARITY
Resolution of better than 0.02 nm is achieved with high-intensity, low-energy hollow cathode UV source lamps. This high-resolution design enables unparalleled linearity over a wide dynamic range, which leads to simple, robust data analysis.
APPLICATION FLEXIBILITY
Designed for a variety of gas monitoring and process control applications, the 931 delivers reliable, field-proven single-species measurements. This makes it ideal for high-concentration H2S, monitoring of sour gas pipelines, or process control of SRU tail gas treating units.
The 931 is our single-gas measurement solution for process monitoring and control applications – Find out more.
Features
- Low-maintenance design
- No moving parts
- Minimal span drift
- Stream-switching capability
Specifications
- Methodology: Dual wavelength, high resolution, nondispersive UV/VIS
- Full Scale Ranges: ppm and % vol are standard, other ranges are available
Standard Range
- H2S: 0 to 4,000 ppm min. to 0 to 100% max.
- Other components and ranges are available upon request. Other components may include NH3, COS, CS2 and SO2
- Accuracy:
- Standard range (UV): ±1% of full scale
- Optional (TCD) H2 sensor for TGTU applications: ±2% of full scale
- Optional (IR) sensor for THC, CO2: application specific, consult factory
- Repeatability: Better than ±0.5% of full scale
- Linearity: Better than ±1% of full scale for H2S
- Zero Drift: Better than ±2% of full scale, with auto zero disabled over 24-hour period
- Speed of Response: Typically less than 30s to T90 (excluding sample system)
- Number of Gases: one
- Zero Gas: Nitrogen or instrument air
- Maximum Sample Cell Pressure:: 6.9 barg (100 psig)
- Maximum Sample Gas Temperature:: 165 ºC (329 ºF)
- Typical Sample Flow: 2.5 L/min (5 SCFH)
- Sample Transport: Application dependant (options include Heated Acid Gas probe)
- Outputs:
- Up to 4 isolated 4-to-20 mA, loop or selfpowered, 30 VDC Max; 4 non-isolated 1 to 5 VDC;
- 5 independent sets of SPDT, Form C, potential free alarm relay contacts, 2 A at 240 VAC
- Digital Communication: RS485 Modbus port; RS232 / RS485 service port
- Utility Requirements:
- 120 VAC (104 to 132 VAC), 47 to 63 Hz, <3A
- 240 VAC (207 to 264 VAC), 47 to 63 Hz, <2A
- Power Consumption: 500 W max. (with heated probe and cell)
- Ambient Temperature: 0 to 50°C (32 to 122°F)
- Physical Dimensions: 1185 x 780 x 254 mm (46.65 x 30.7 x 9.97 in.)
- Weight: Approximately 145 kg (320 lbs)
Certifications
- CEC Class I, Division 1, Groups C&D; Ex d IIB + H2, T3
- NEC Class I, Division 1, Groups C&D; AEx d IIB + H2, T3
- CEC/NEC Class I, Division 2, Groups B, C&D, ExP T3 (unit verification)
- ATEX II 2 G Ex d IIB T3 Gb (IIB + H2 unit verification pending)
- Russian Ex Proof Certification; 1ExdIIBT3 X
- Russian Gosstandart Pattern Approval
- Complies with all relevant European directives
Applications
- Hydrogenation Reactions (hydrogen sulfide, hydrogen)
- Feed gas analysis
- Reaction rate monitoring
- Impurity detection
- Quality assurance monitoring
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